Automatic regulator



March 31, 1931. w. D. DREISKE AUTOMATIC REGULATOR FiledJan lZ, 1928 2 Sheets-Sheet l fit/ m? Wm D. Dnazls X-e March 31, 1931. w, DRE|SKE 1,798,932

AUTOMAT I C REGULATOR Filed Jan. 12, 1928 2 Sheets-Sheet 2 Ram?? WLa'aJz/Z). Dmzlae Patented Mar. 31, 1931 J retreat orrrc a WILMAM Di DREISKE, or oAK Mummers Amomer ane ne'rqa Application filed January 12; 1928. Serial N'b. 2516;1{14z This invention relates to automatic controlling apparatus in general, but more par.- ticularly to apparatus of thisikindkforautomatically controlling a boiler furnace damper, thereby to automatically maintain, as nearly as possible, a uniform and predetermined steam pressure;

Generally stated, the object of the invention isto provideia novel and: improved automatic controlling apparatus having a horizontally disposed counterbalance arm and having a vertically movable compensating device for modifying the action of. saidiicounterbalancearm.

l5 It is also an objecttolprovide certain do tails and features of construction and combis nations tending to increase the generalaeflt ciency and the desirability of an automatic m controlllng apparatusofthls particular character.

To the foregoing and! other useful ends, the invention consists in the mattershereinatter set forth and claimed, and shown ill: the accon'ipanying drawings,inwhich,

Fig. 1 is asideielevation, more or less diagrammatic in character, showing an automatic controlling apparatus embodying the principles oi the invention. i

n Fig. 2 is a similar View, showing a. differentf-ormoifithe lnvention.

As thus illustratedgand" referring to; Fig. 1 theinventioir comprises a honizonta'lljyf disposedi counterbalance arm ll tu'lcrumed at 2 M on a stationary portion of the apparatus, and supported on a knife edge 3 carried; by the diaphragm of the pressuneresponsive device l which latter is connectedi by apipe 5 with the steam or other fluid pressure, whereby any variation of the pressure. will causethe arm 1 to moveup andd'own, this alum pile-ferably having a counterbalanceWeight.6 hung thereon. A compensating device, for modifyingthe action of said arm, is providechcomprising a vertically disposedarm- 7 rigid with the" arm 1, a vertically disposed arm or'har.

8 pivoted at 9, at itsupper endt, on a stationary portion of the: apparatus, together with a trateler lOhavin g wheelsflficr engaging the opposing edgesof said: arms/K and! 8 which traveler is suspended on a rod 11 that-is pivotedat1 2,,at its upper end, on. an arm 13 carried by: the piston rod 14 of' thevertically movable piston head I in the cylinder 16, which: latter'is practically supported invertically disposed positioirclirectly;abovethesaid pnessune responsi ve device. 'lihe valxve mechanisml 'li controls the supply of; steam or other pressure tor theoyl'inder; to; operate the said piston therein, a11d this valve mechanism is controlled: by anarm 18 vvhich is. rigid? with the arm 1 and suitably connected to said mechanism,- ih compensating counterbalance Weight 19 is- GOHDQOlZBClvbYaI eable120 with the lower end of the previously mentioned arm Stthiscablebeingsupported on a sheave 21 suitably.- mounted: on some stationary portion of; the apparatus. "Elie; upper end ofthe rod h is suitably connected; with. the dampenQQ ofthe boiler furnace smoke. fluev VVfith this construction and"aamangement, theQarm; 1 moves downward, of course, when the pressure "falls in, thedevice 4:, andv this operatesthe valve: mecl' a nis-m 17 to cause the pressured-n the cylinderlG tomove-the piston 15-dOYVIlWiLIldi,thllflfiflllfillfigrthe opening movemeat of the damper 22; in thesmolre time. Also, this causes; downward movement of the traveler 10.between the arms 7 and 8, whereby the efiectivepull of; the weight 19, thnough the barsi'l v and 8- and; the traveler 1'0, upon the arm: 1 is recl-uced,asithe leverage is reduced, of course, as, the traveler 10 moves down-ward and shortensthe-v distance between itsrpoint; ofengagement with the arm 7, and the arm 1! below lll hen the pressure in the device l risesaboverthegdesieed; point, the arm-l; isimovedrupwa zthand thereverseaetion takes; place, the traveler 1E0-movingupward to increase; the efliective pull 0t thevvehrht 1 9 011 the-arm 1,,in a manner thatwwill be readily understood- In! this Way, the compensating dearijcei modifies the action oi? the arm l, ;i nra mannerea-leulated to maintain the steam pressure more; nearly at a uniform pr s re 1 v a a a a a D In, F st 2- th o nst i m is ubstant a y the, same that 'preaiiously described, but in this; case; a rotary motor. 23, is employed in Place em c pro at g: mot ows n Hig L ot the; drawings; Ehie; rotary motor is preferably an electric motor of the well known kind, that is, self-braking, so to speak, having a positive start and stop, and the motor is also of the kind that is reversible. Said motor is connected by a cable 23 with a damper 24 in the smoke flue of the boiler furnace, and the motor is also connected by a cable 25 with the traveler 26 that travels up and down between the bars 27 and 28, which bars are like the bars or arms 7 and Spreviously mentioned. The rotary motor 23, therefore, operates to pull the traveler 26 downward, when the pressure falls and the damper 2A is to be opened,- and serves to pull the traveler 26 upward when the pressure rises to a certain point and when the damper isto be closed, so that the effectiveness of the weight 29, which is connected and arranged exactly the same as the weight 19 previously mentioned, is automatically varied, as previously explained. The motor has a controller in the form of a switch, comprising the stationary contacts 30 and 31 and the movable contact 32 between them, the contact 32 being normally in the positionshown. Thecontacts 30 and 31 are included, it will be understood, in circuits including the motor 23 and a source of electric current. The contact 32 is rigid with the counterbalance arm 33, and when the latter moves downward, the contact 32 engages the contact 31'and causes the motor to rotate in the direction indicated by-the arrow 34, thereby 'to cause an opening movement of the damper. On the other hand, when the arm 33 moves upward, the motor rotates in the opposite direction, thus causing the closing movement of the damper.

In either form of the invention, therefore, the compensating device is provided, in combiuation with a horizontally disposed counterbalance arm, but the compensating device is movable up and downor vertically, thereby to in effect increase or decrease the effective downward pull of the weight 19 or the weight 29, on the counterbalance arm, in the manner explained, and in this way the steam or other pressure is maintained more nearly uniform.

Thus a variable leverage pressure is exerted through the traveler (10 or '26) andthere is a double action leverage as the leverage of both arms (7 and 8 or'27 and 28) is changed by the up and down movement of the traveler. It is through this double acting variable leverage that the weight (19 or 29) exerts a pull on the counterbalance arm (1 or 33) of the apparatus. r

Without disclaiming anything, and without prejudice to any novelty disclosed, what I claim as my invention is:

1. Automatic controlling apparatus, comprising a motor for operating the means to be controlled, a horizontally disposed counterbalance arm, pressure responsive means'for causing said arm to move up anddownpa counterbalance -'weight 'supported'for up and between by said motor.

down movement only, and mechanical compensating means having an element thereof movable up and down by said motor and com prising lever means engaging said element and providing a variable leverage pressure transmitted horizontally through said up and down movable element, said compensating means being-connectedto said arm and operative thereby in efiect to vary the efiective pull of said weight transmitted through said element on said counterbalance arm.

2. A structure as specified in claim 1, said compensating means comprising a vertically disposed arm'rigid with said counterbalance arm, a pivoted arm disposed substantially parallel with said vertically disposed arm,

said counterbalance weight being connected to the'tree end of said pivoted arm, together with a traveler forming said element and engaging the opposing edges of said vertically disposed arms and movable up and down therebetween by said motor. I

r "3; A structure'as specified in claim 1, said compensating means comprising a vertically disposed arm'rigid with-said counterbalance arm, a pivoted: arm disposed substantially parallel with said vertically disposed arm, said counterbalance weight being connected to the free end of said pivoted arm, together with a traveler'forming said element a'nd'engaging the opposing edges of said vertically disposedvarms and'mo'vable'up and down therebetween by said motor, said vertically disposed arm having its lower end rigid with said counterbalance arm, and said pivoted 1 arm being pivoted at its upper end, and the weightbeing connected to the lower end of "this pivoted arm.

4. A structure as specified in claim'l said compensating means comprising substantiallyiparallel arms and a traveler fOIIIllIlgfiMd element and engaging the opposing edges of said arms and movable back and forth there- 5. In automatic' controlling apparatus, a

compensating device comprising substantially parallel arms, one arm being pivoted at one end thereof, the other armbeing rigid at the other end with a movable element of the controlling apparatus, means tending con- 'stantly to move the free end of the pivoted arm toward the other arm, a traveler engaging the opposing edges of said arms, and

means for operating said traveler back and forth between the arms, thereby in effect to change the leverage communicated through said compensating device to said movable element. 7 I V 6. A structure as specified in claim 5, said movable element being, a variable pressure 11:.

operated counterbalance arm.

7. A structure as specified 1n claimb, said areas being vertically disposed, and said traveler'being movable up anddown between said arms. is Y 8. A structure as specified in claim 5, said means for operating the traveler comprising suspension means to reciprocate said traveler between said arms.

9. A structure as specified in claim 5, said means for operating said traveler comprising a depending swinging support to operate the traveler up and down between said arms.

10. Automatic controlling apparatus, comprising a motor for operating the means to be controlled, a horizontally disposed counterbalance arm, pressure responsive means for causing said arm to move up and down, a counterbalance Weight, and compensating means having an element thereof movable up and down by said motor, to provide a variable leverage and operative to thereby in effect vary the eli'ective pull of said Weight on said counterbalancing arm, said compensating means comprising a vertically disposed arm rigid with said counterbalance arm, a pivoted arm disposed substantially parallel with said vertically disposed arm, said counterbalance Weight being connected to the free end of said pivoted arm, together With a traveler forming said element and engaging the opposing edges of said vertically disposed arms and movable up and down therebetiveen by said motor.

11. Automatic controlling apparatus, co1nprising a motor for operating the means to be controlled, a horizontally disposed counterbalance arm, pressure responsive means for ausi11g said arm to move up and down, a counterbalance weight, and compensating means having an element thereof movable up and down by said motor, to provide a variable leverage, and operative to thereby in effect vary the eflective pull of said Weight on said counterbalance arm, said compensating means comprising a vertically disposed arm rigid with said counterbalance arm, a pivoted arm disposed substantially parallel with said vertically disposed arm, said counterbalance Weight being connected to the free end of said pivoted arm, together with a traveler forming said element and engaging the opposing edges of said vertically disposed arms and movable up and down therebetween said motor, said vertically disposed arm having its lower end rigid With said counterbalance arm, and said pivoted arm being piv oted at its upper end, and the Weight eing connected to the lower end of this pivoted arm.

12. Automatic controlling apparatus comprising a motor for operating the means to be controlled, a horizontally disposed coun-' tel-balance arm, pressure responsive means for causing said arm to move up and down, a counterbalance Weight, and compensating means having an element thereof movable up and down by said motor, to provide a variable leverage and operative to thereby in effect vary the effective pull of said weight ary, 1928. 1

WILLIAM D. DREISKE. 

